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2-6. CONNECTING WIRES FOR INDOOR UNIT

You can connect indoor/outdoor lead wire without removing the front grille.

1) Open the front grille.
2) Remove  panel.
3) Remove electrical cover.
4) Remove cord clamp.
5) Pass indoor/outdoor unit connecting wire (A) from the back of the indoor unit and 

process the end of the wire.

6) Loosen terminal screw, and connect first the earth wire, then indoor/outdoor unit con-

necting wire (A) to the terminal block. Be careful not to make mis-wiring. Fix the wire 
to the terminal block securely so that no part of its core is appeared, and no external 
force is conveyed to the connecting section of the terminal block. 

7) Firmly tighten the terminal screws to prevent them from loosening. After tightening, 

pull the wires lightly to confirm that they do not move.

8) Secure indoor/outdoor unit connecting wire (A) and the earth wire with the cord 

clamp. Never fail to hook the left claw of the cord clamp. Attach the cord clamp se-
curely.

Indoor terminal block

Indoor/outdoor unit 
connecting wire (A)

Outdoor terminal block

Earth wire 
(green/yellow)

•  Make earth wire a little longer than others. (More than 55 mm)
•  For future servicing, give extra length to the connecting wires.

Lead wire

Terminal block

Fixing screw

Indoor/outdoor unit 
connecting wire (A)

Electrical cover

Cord clamp

35 mm

15 mm

2-7. PIPE FORMING AND INSTALLATION

Pipe Forming

•  Route the drain hose diagonally below the connecting pipes.
•  Make sure that the drain hose is not routed upward and that there are no waves in 

the hose.

•  Do not pull the hose when applying the tape.
•  Route the piping so that it does not project past the rear of the indoor unit. (Refer to 

the figure to the right.)

Connecting Pipe Installation

•  Install the connecting pipes so that the piping can move slightly to the front, back, 

left, and right.

Piping 
tape

Drain hose

Refrigerant 
piping

Piping bent outward

Push

•  Be sure to insulate the connecting pipes and place them near the rear of the indoor 

unit so that they do not contact the front panel.

•  Be careful not to crush the connecting pipes when bending them.

RIGHT DOWNWARD PIPING

OTHER PIPING

Band (5)

Remove the 
cover.

Pipe cover (4)

Band (5)

FOR LEFT OR LEFT-REAR PIPING
Bundle the connecting pipes and drain hose together, and then wrap them in felt tape (11).

Cut and use the lower side panels on the left and right sides of the indoor unit as shown 
below.
Smooth the cut edges of the side panels so that they will not damage the insulation coat-
ing.

•  For left or right piping 

 

•  Installing flush against a wall with molding

Molding

Cut the lower side panels to match the 
height of the molding.

Wrap the felt tape (11) tightly around the pipes and hose starting near where the 
pipes and hose are routed from the indoor unit. (The overlap width of the felt tape (11) 
should not be more than 1/2 of the tape width.)

Start wrapping the piping tape (G) 
around the pipes and hose 10 mm 
inside the indoor unit.

Fasten the end of the felt tape (11) with 
a bandage stopper.

Make sure that the drain hose 
is not routed upward.

Felt tape (11)

Summary of Contents for MFZ-FB50VA

Page 1: ...ompressor If the compressor is started before the refrigerant pipes are connected and when the stop valve is open air could be drawn in and the pressure in the refrigeration cycle could be come abnormally high This could cause the pipes to burst or injury N Fasten a flare nut with a torque wrench as specified in this manual If fastened too tight a flare nut may break after a long period and cause ref...

Page 2: ...inutes and pump down before removing the old air conditioner Remake flare accord ing to the dimension for new refrigerant 2 INDOOR UNIT INSTALLATION Note Place indoor outdoor unit connecting wire A and power supply cord K at least 1 m away from the TV antenna wire Air inlet Air outlet Outdoor unit installation 4 10 mm 21 mm slot 840 mm 500 mm 169 mm 40 mm 392 mm 330 mm 360 mm IMPORTANT NOTES To com...

Page 3: ...If the horizontal bars will block the lower air outlet use a stand etc to adjust the height of the indoor unit If the upper or lower air outlet is blocked the air conditioner will not be able to cool or warm the room well Do not block the receiver with the grating Otherwise the grating will interfere with the remote controller signal and significantly reduce the distance and area angle from which t...

Page 4: ... pipes Make sure that the drain hose is not routed upward and that there are no waves in the hose Do not pull the hose when applying the tape Route the piping so that it does not project past the rear of the indoor unit Refer to the figure to the right Connecting Pipe Installation Install the connecting pipes so that the piping can move slightly to the front back left and right Piping tape Drain ho...

Page 5: ...75 ø15 88 5 8 29 73 5 to 78 4 750 to 800 Smooth all around Even length all around Inside is shin ing without any scratches Flare nut Die Fig 5 Fig 6 Copper pipe Do not make drain piping as shown below Accumulated drain water Air Waving Water leakage Do not raise Water leakage Water leakage Tip of drain hose dipped in water Ditch At least 50 mm gap Downward slope Drain hose Soft hose I D 15 mm Drai...

Page 6: ...remote controller how to remove the air filters how to remove or put the remote controller in the remote controller holder how to clean precautions for operation etc Recommend the user to read the OPERATING INSTRUCTIONS carefully Emergency operation switch E O SW Caution After test run or remote signal reception check turn off the unit with the E O SW or the remote controller before turning off the...

Page 7: ... to the indoor control board of an air conditioner with a connect ing cable Cutting or extending the connecting cable of the interface results in defects in connecting Do not bundle the connecting cable together with power supply cord indoor outdoor connecting wire and or earth wire Keep as much distance as pos sible between the connecting cable and those wires The thin part of the connecting cabl...

Page 8: ...HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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